| Abbreviation | Definition |
|---|---|
| URTC | Upper Ridgewood Tennis Club |
| USMCC | US Mens Clay Court |
| USNTA | United States National Tennis Academy |
| USPTA | United States Professional Tennis Association |
| USTA | Underarm Serving Tennis Aces |
| USTA | United States Tennis Association |
| USTT | United States Table Tennis |
| USTTA | U S Table Tennis Association |
| USTTA | United States Table Tennis Association |
| UTR | Universal Tennis Rating |
| UTR | Universal Tennis Ratings |
| UTS | University of Toronto Scarborough tennis centre |
| UTT | Ultimate Table Tennis |
| VBTC | Vic Braden Tennis College (Utah) |
| VMTT | Veyre Monton Tennis de Table |
| WATA | Western Arkansas Tennis Association |
| WATL | Washington Area Tennis League |
| WBTA | West Bend Tennis Association |
| WBTL | Warsaw Business Tennis League |
| WCJT | World Center for Japanese Tennis |